Modeling of soil nutrient balances, flows and stocks revealed effects of management on soil fertility in south Ecuadorian smallholder farming systems

Bahr, Etienne; Zaragocin, Diego Chamba; Jaramillo, Natacha del Cisne Fierro; Witt, Anke; Makeschin, Franz

doi:10.1007/s10705-014-9662-5

Cited by 12 publications

(22 citation statements)

References 80 publications

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“…Previous studies about K balance have mainly focused on specific experimental sites [ 15 , 28 – 31 ] or short-term observations at national level [ 32 ], but it is difficult to show in-depth analysis of element balances based on specific experimental sites or one-year studies [ 3 ]. Although a negative K balance might not occur in the short term, long-term negative K balance is still a potential problem [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

Temporal and spatial variation of potassium balance in agricultural land at national and regional levels in China

Liu

Ding

et al. 2017

PLoS ONE

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Linking potassium (K) balance to soil fertility creates a valuable indicator for sustainability assessment in agricultural land-use systems. It is crucial for the efficient use of K resources, food security and resource sustainability to realize soil K balance status in China. Therefore, temporal and spatial changes of K balance for farmland in China from 1980 to 2015 were analyzed at national and regional levels using statistical data and related parameters. At the national scale, K input increased from 6.78 Mt K2O in 1980 to 23.44 Mt K2O in 2015 with an average annual increment of 0.48 Mt K2O, and output changed from 8.10 Mt in 1980 to 21.31 Mt in 2015 with an average annual increment of 0.38 Mt K2O as well. On average, K balance was -24.17, -5.92, 21.31 and 19.50 kg K2O ha-1 in 1980s, 1990s, 2000s and 2010s, respectively. Moreover, the average balance of six regions was considerably different which were -21.37, 1.25, 13.70, -22.79, 99.22 and 7.18 kg K2O ha-1 from 1980 to 2015. The potassium use efficiency (KUE) decreased with time which were 127.09, 104.35, 87.69 and 89.69% in 1980s, 1990s, 2000s and 2010s, respectively, and the decline of slope could also reflect the variation tendency of KUE. Great variation of K balance across different regions demonstrated that fertilizer application and management practices need to be adjusted to local conditions.

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Section: Introductionmentioning

confidence: 99%

Temporal and spatial variation of potassium balance in agricultural land at national and regional levels in China

Liu

Ding

et al. 2017

PLoS ONE

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“…Nutrient removal by crop harvest to total nutrient output (harvest, leaching, erosion, runoff, burning, gaseous loss) from the soil is as large as 34-72% for N, 28-87% for P, and 22-92% for K in case of low erosion loss or without taking erosion into account (Dechert et al 2005, Frissel 1978, Nkonya et al 2005, van der Pol & Traore 1993. Even in case of high erosion loss, the ratio is not so small (Bahr et al 2015, Dung et al 2008 at 11-17% for N, 9-22% for P, and 2-8% for K. We estimated the ratio of NPK removal by maize harvest to NPK stock in the soil. In our surveyed maize fields in Xayabury Province, total NPK in the soil (0-20 cm deep and bulk density of 1.1 g cm −3 ) was estimated to be 2,980 kg N ha −1 as total N, 10.1 kg P ha −1 as available P, and 233 kg K ha −1 as exchangeable K. The ratio of NPK removal by maize harvest to NPK in the soil was estimated to be 1.7% of total N, 74% of available P, and 6.1% of exchangeable K (Table 3).…”

Section: Nutrient Removal By Maize Harvest and Nutrient Level In Soilmentioning

confidence: 99%

“…In our surveyed maize fields in Xayabury Province, total NPK in the soil (0-20 cm deep and bulk density of 1.1 g cm −3 ) was estimated to be 2,980 kg N ha −1 as total N, 10.1 kg P ha −1 as available P, and 233 kg K ha −1 as exchangeable K. The ratio of NPK removal by maize harvest to NPK in the soil was estimated to be 1.7% of total N, 74% of available P, and 6.1% of exchangeable K (Table 3). We calculated the ratio of NPK removal by maize harvest to NPK in the soil using data from previous studies on maize fields in tropical areas (Bahr et al 2015, Bedada et al 2016, Bekunda & Manzi 2003, Dechert et al 2005, Yanai et al 2007). As a result, said ratio accounted for 0.3-2.4% of total N, 2-87% of available P, and 2-14% of exchangeable K in the soil.…”

Section: Nutrient Removal By Maize Harvest and Nutrient Level In Soilmentioning

confidence: 99%

NPK Removal from Maize Cultivation Fields in Kenethao and Paklai Districts, Xayabury Province, Lao PDR

Matsumoto

Oudthachid

Khanthavong

et al. 2020

JARQ

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And nutrients removed through maize crop harvest may lead to land degradation.Nutrients are removed from the soil at crop harvests. The application of fertilizer supplies nutrients to support crop growth and replenish soil nutrient stocks. Tan et al. ( 2005) estimated global soil NPK budgets for major crop production in 2000, and suggested that soil nutrient depletion can be attributed to insufficient nutrient inputs in many developing countries and in all of the least developed countries. Analyzing the nutrient balance in farmland is useful for understanding nutrient depletion in farmland and reveals the effects of nutrient management practices in cropping systems on soil nutrient status (e.g., Frissel 1978). When a field has a lot of nutrients in the soil with no or low fertilizer input, the amount of nutrient uptake by the crop is higher than the amount of nutrient input to the farmland; hence, the nutrient balance becomes negative (Haileslassie et al. 2006, He et al.

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“…Furthermore, smallholder farmers in Ethiopia have limited resources to cover cost of fertilizers to adequately replace nutrients that have been removed by harvest and losses by erosion or to the atmosphere and leaching. Soil nutrient monitoring can provide valuable indicators for sustainable soil fertility management by linking nutrient balances and soil nutrient stocks (Bahr et al, 2014;Guillermo, Dercon, & Cadisch, 2010). To meet the increased food demand, soil nutrient depletion needs to be counterbalanced by soil fertility management practices (van Beek et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Nutrient balances in smallholder farms in northern Ethiopia

Mesfin

Gebresamuel

Zenebe

et al. 2020

Soil Use and Management

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Depletion of soil nutrient is a major impediment for food production in sub-Saharan Africa, but little is known about nutrient dynamics at the farm level. Therefore, the objective of this study was to evaluate nutrient management on a range of contrasting farms by estimating balances of N, P and K. Representative farmers of three wealth classes (rich, medium and poor) were selected from two different agro-ecological regions (Alaje and Raya Azebo) in northern Ethiopia. The MonQI model based on data obtained from farm questionnaires was used for processing and analysis of partial nutrient balances (input from mineral and organic fertilizer minus output with crop and straw) and full balances (all input sources minus output with crop, erosion, leaching and gaseous losses).

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Modeling of soil nutrient balances, flows and stocks revealed effects of management on soil fertility in south Ecuadorian smallholder farming systems

Cited by 12 publications

References 80 publications

Temporal and spatial variation of potassium balance in agricultural land at national and regional levels in China

Temporal and spatial variation of potassium balance in agricultural land at national and regional levels in China

NPK Removal from Maize Cultivation Fields in Kenethao and Paklai Districts, Xayabury Province, Lao PDR

Nutrient balances in smallholder farms in northern Ethiopia

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